Compound bow structure

ABSTRACT

A compound bow structure includes a riser having a grip and a recess is defined in the inside of the grip. A first cam and a second cam are respectively connected to the two limbs and a string is connected between the first and second cams. Two cables each have a first end connected to the first/second cam corresponding thereto. The two cables each have a second end which has two split sub-cables. The sub-cables of the two cables are respectively connected to two sides of the first/second cam corresponding thereto. A protector is connected to the inside of the grip and located to cover the recess of the grip. The string bounces toward the protector along a plane that passes through the rear side of the protector. A gap is formed between the grip and the protector to accommodate the user&#39;s hand.

BACKGROUND OF THE INVENTION

1. Field of the Invention

This is a Continuation-In-Part application of applicant's formerapplication 14/249,324, filed on Apr. 9, 2014.

2. Description of Related Art

A conventional compound bow generally includes a bow and two limbsextending from two ends of the riser, and each limb has a cam unitconnected thereto. A string is connected between the two cam units onthe limbs of the bow. The string is pulled away from the riser to storeenergy. An arrow is attached with the string by its nock so that whenthe string is released, the arrow is delivered to the target by theenergy.

However, the user's hand holding the riser is located on the plane thatthe string bounces back so that it is possible that the user's hand ishit by the string. The string that bounces back releases a significantenergy which can easily injure the user's hand.

U.S. Pub. No. 2007/0256675 A1 discloses a compound bow with a bridgeremovably connected to the riser so that a cable guide roller isconnected to the bridge. However, as described in paragraphs 0032 and0033 of Smith, the bridge is not used to protect the user's hand frombeing hit by the string when in use. The cable guide roller is mountedto the bridge which is removably connected to the riser for a benefit ofstorage purposes.

The present invention provides a compound bow structure with a protectorso as to mitigate and/or obviate the disadvantages of the conventionalbows.

SUMMARY OF THE INVENTION

The main objective of the present invention is to provide a compound bowstructure which has a protector located between the grip and the stringso as to protect the user's hand from being hit by the string after thestring is released.

The present invention provides a compound bow structure and comprises ariser having a grip, and two extensions extend from two ends of thegrip. A recess is defined in the inside of the grip. Two limbs arerespectively connected to two distal ends of the two extensions. Aprotector is connected to the inside of the grip and located between thetwo limbs. The protector has a front side and a rear side, wherein thefront side of the protector faces the recess and covers the recess ofthe grip. A control unit has a first cam and a second cam respectivelyconnected to two respective distal ends of the two limbs. A string isconnected between the first and second cams. Two cables each have afirst end connected to the first/second cam corresponding thereto. Thetwo cables each have a second end which has two split sub-cables. Thesub-cables of the two cables are respectively connected to two sides ofthe first/second cam corresponding thereto. The rear side of theprotector faces the string. A distance “L” between a lowest point of therecess and the string is smaller than ⅕ of a length of the string. Whenthe string is pulled away from the protector and released, the stringbounces toward the protector along a plane that passes through the rearside of the protector.

Preferably, the protector is an elongate plate which has two ends, andthe two ends of the protector are connected to two ends of the recess. Agap is formed between the grip and the protector so as to accommodatethe user's hand.

Preferably, each of the two limbs has a notch to form a first arm and asecond arm. The first and second cams are respectively located in thetwo notches of the two limbs. The axle of each of the first and secondcams is connected between the first and second arms correspondingthereto.

Preferably, the sub-cables of the cables are respectively connected totwo ends of the axle of the first/second cam corresponding thereto toadjust the tension of the string and to adjust the distance between thestring and the riser.

Preferably, the coefficient of elasticity of each of the two limbs islarger than that of the riser.

Preferably, the distance between the lowest point of the recess and thestring is equal to ⅙ of the length of the string.

Further benefits and advantages of the present invention will becomeapparent after a careful reading of the detailed description withappropriate reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of the compound bow structure of thepresent invention;

FIG. 2 is an exploded view to show the limbs with the string and theriser of the compound bow structure of the present invention;

FIG. 3 is an exploded view to show the protector and the riser of thecompound bow structure of the present invention;

FIG. 4 is side view to show the compound bow structure of the presentinvention, wherein the string is not yet pulled;

FIG. 5 is side view to show the compound bow structure of the presentinvention, wherein the string is pulled;

FIG. 6 is side view to show the compound bow structure of the presentinvention, wherein the string is released;

FIG. 7 shows the relative position relationship between the protectorand the string, wherein the string moves along the plane that passesthrough the protector when the string bounces back, and

FIG. 8 shows that the rear side of the protector is tilt relative to theplane and the gap has a larger entrance for convenience of insertion ofthe user's hand into the gap.

DETAILED DESCRIPTION OF THE INVENTION

Referring to the drawings and initially to FIGS. 1 to 3, the compoundbow structure in accordance with the present invention comprises a riser1 having a grip 11, and two extensions 12 extend from two ends of thegrip 11. The riser 1 has an inside 13 and an outside 14. A recess 131 isdefined in the inside of the grip 11. Two limbs 2 respectively connectedto the two distal ends of the two extensions 12. Each of the two limbs 2has a notch 21 to form a first arm 22 and a second arm 23. A protector 3is connected to the inside of the grip 11 and located between the twolimbs 2. The protector 3 is an elongate plate with two ends and acertain width, and has a front side 31 and a rear side 32. The two endsof the protector 3 are connected to two ends of the recess 131 to coverthe recess 131. A gap 5 is formed between the grip 11 and the protector3 so as to accommodate the user's hand. The front side 31 of theprotector 13 faces the recess 13 and covers the recess 131 of the grip11.

A control unit 4 comprises a first cam 41 and a second cam 42respectively connected to two respective distal ends of the two limbs 2.In detail, the first and second cams 41, 42 are respectively located inthe two notches 21 of the two limbs 2. Each of the first and second cams41, 42 has an axle 6 extending therethrough. The axle 6 of each of thefirst and second cams 41, 42 is connected between the first and secondarms 41, 42 corresponding thereto.

A string 43 is connected between the first and second cams 41, 42. Twocables 44 each have a first end connected to the first/second cam 41/42.The two cables 44 each have a second end which has two split sub-cables441. The two sets of the sub-cables 441 of the two cables 44 arerespectively connected to the two ends of the axle 6 of the first/secondcam 41/42 corresponding thereto to adjust the tension of the string 43and to adjust the distance between the string 43 and the riser 1. Therear side 132 of the protector 13 faces the string 43. The string 43 ispulled away from the protector, and bounces toward the protector 3 alonga plane that passes through the rear side 32 of the protector 3.

Further referring to FIG. 4, the distance “L” between the lowest pointof the recess 131 and the string 43 is smaller than ⅕ of the length “D”of the string 43. Preferably, the coefficient of elasticity of each ofthe two limbs 2 is larger than that of the riser 1.

When in use, further referring to FIG. 5, the user holds the grip 11 ofthe riser 1 and the protector 3 covers the hand holding the grip 11.

The other hand of the user pulls the string 43 away from the riser 1.The first and second cams 41, 42 are then rotated and the two limbs 2are slightly deformed. An arrow (not shown) is attached to the string 43by its nock. The stroke that the string 43 is pulled from its initialposition to the maximum position decides the distance that the arrow canreach. The longer the stroke is pulled, the longer distance that thearrow can reach. When the string 43 is released, as shown in FIGS. 6 and7, the string 43 bounces back and toward the protector 3 along a planethat passes through the rear side 32 of the protector 3. By theprotector 3, the user's hand is protected from being hit by the string43. The rear side 32 of the protector 3 can be intersected with theplane that the string 43 moves along at a desired angle as long as theuser's hand is protected from being hit by the string 43. In otherwords, the rear side 32 of the protector 3 can be tilt relative to theplane to allow the gap 131 to have a larger entrance for convenience ofinsertion of the user's hand into the gap 131 as shown in FIG. 8. Byadjusting the angle of the protector 3 relative to the plane, aleft-handed user and a right-handed user can easily insert his/her handinto the gap 131.

The protector 3 is durable and light in weight. Preferably, theprotector 3 is made by plastic or hard rubber. The protector 3 can beconnected to the grip 11 by using screws, rivets or by way of snapping.The user's hand in the gap 5 is large enough to allow the user's hand toeasily inserted and remove. Preferably, the distance “L” between thelowest point of the recess 131 and the string 43 is equal to ⅙ of thelength “D” of the string 43.

Furthermore, the notch 21 defined in each of the two limbs 2 reduces theweight of the limb 2. The first and second cams 41, 42 are locatedwithin the two respective notches 21 to allow the shorter limbs 41, 42to be used.

The sub-cables 441 of each of the cables 44 are respectively connectedto the two ends of the axle 6 of the first/second cam 41/42corresponding thereto to adjust the tension of the string 43 and toadjust the distance between the string 43 and the riser 1.

The coefficient of elasticity of each of the two limbs 2 is larger thanthat of the riser 1 so as to allow the limbs 2 to be further deformedrelative to the riser 1 to obtain longer stroke.

The riser 1 and the limbs 2 can be integral to each other, or the riser1 and the limbs 2 can be assembled to each other. The weight of thelimbs 2 is controlled not to increase the whole weight of the compoundbow structure of the present invention. The proper length of the limbs 2can stabilize the compound bow structure without being affected by thereturn of the string 43.

Although the invention has been explained in relation to its preferredembodiment, it is to be understood that many other possiblemodifications and variations can be made without departing from thespirit and scope of the invention as hereinafter claimed.

What is claimed is:
 1. A compound bow structure comprising: a riserhaving a grip and two extensions extending from two ends of the grip, arecess defined in an inside of the grip, two limbs respectivelyconnected to two distal ends of the two extensions; a protectorconnected to the inside of the grip and located between the two limbs,the protector having a front side and a rear side, the front side of theprotector facing the recess and covering the recess of the grip, and acontrol unit having a first cam and a second cam respectively connectedto two respective distal ends of the two limbs, a string connectedbetween the first and second cams, two cables each having a first endconnected to the first/second cam corresponding thereto, the two cableseach having a second end which has two split sub-cables, the sub-cablesof the two cables respectively connected to two sides of thefirst/second cam corresponding thereto, the rear side of the protectorfacing the string, a distance “L” between a lowest point of the recessand the string being smaller than ⅕ of a length of the string, thestring being pulled away from the protector, and bouncing toward theprotector along a plane that passes through the rear side of theprotector.
 2. The compound bow structure as claimed in claim 1, whereinthe protector is an elongate plate which has two ends, the two ends ofthe protector are connected to two ends of the recess, a gap is formedbetween the grip and the protector so as to be adapted accommodate auser's hand.
 3. The compound bow structure as claimed in claim 2,wherein each of the two limbs has a notch to form a first arm and asecond arm, the first and second cams are respectively located in thetwo notches of the two limbs, each of the first and second cams has anaxle extending therethrough, the axle of each of the first and secondcams is connected between the first and second arms correspondingthereto.
 4. The compound bow structure as claimed in claim 3, whereinthe sub-cables of the cables are respectively connected to two ends ofthe axle of the first/second cam corresponding thereto to adjust atension of the string and to adjust a distance “L” between the stringand the riser.
 5. The compound bow structure as claimed in claim 1,wherein a coefficient of elasticity of each of the two limbs is largerthan that of the riser.
 6. The compound bow structure as claimed inclaim 1, wherein the distance “L” between the lowest point of the recessand the string is equal to ⅙ of the length of the string.
 7. Thecompound bow structure as claimed in claim 1, wherein the rear side ofthe protector is intersected with the plane that the string moves alongat an angle.
 8. The compound bow structure as claimed in claim 1,wherein the rear side of the protector is tilt relative to the plane tohave a larger entrance of the gap.